Author Topic: BSA C12 Gearbox identification  (Read 304 times)

0 Members and 1 Guest are viewing this topic.

Offline chaterlea25

  • Silver Member
  • ***
  • Posts: 2548
  • Country: ie
  • nr Cork Rep of Ireland
  • Location: Nr. Cork
Re: BSA C12 Gearbox identification
« Reply #15 on: February 28, 2019, 08:56:11 pm »
Hi Fred,

a Google search gave me this link, https://www.technobotsonline.com/0.5-inch-steel-chain-sprockets.html
a replacement 16 tooth for £5 approx
I'm sure you can find a "friend" with a lathe and welder  ;D

Are you going to use the bike in trials or on the road? this will decide the size sprocket you need
Also what number of teeth is on the rear wheel ?

The moto cross bike chain I mentioned last night is a 420MBK (for the narrow C10L sprocket)

John

Offline geo

  • Full Member
  • *
  • Posts: 10
  • Country: england
  • Location: Leeds
Re: BSA C12 Gearbox identification
« Reply #16 on: March 02, 2019, 02:14:48 pm »
The standard 19 tooth gearbox sprocket is available from Kidderminster Motorcycles at £17-90 + postage and I've just fitted one to my '56 C12 with no problems.  tel no is 01562 66679, kmc4bsa@hotmail.com  I've always has good & prompt service from that firm. The standard gearing is fine for normal road use in my limited experience.

George Wilson